I put my crabs in a much bigger tank, and because the tank was so much bigger I got 5 new crabs. I had my other 6 crabs for about 8 months so they were all use to each other. I guess one of the new crabs didn't like his new roomies, and the new roomies didn't like him. Nobody got hurt, and it took about a whole day for them to get use to each other. I even gave the new crabs a bath first.
13 Hermies
1 Dog
2 Cats
2 Fish
2 Wonderful boys
and last but not least 1 man